EP3183933A1 - Évitement de collision avec une transmission synchronisée - Google Patents

Évitement de collision avec une transmission synchronisée

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Publication number
EP3183933A1
EP3183933A1 EP14753076.0A EP14753076A EP3183933A1 EP 3183933 A1 EP3183933 A1 EP 3183933A1 EP 14753076 A EP14753076 A EP 14753076A EP 3183933 A1 EP3183933 A1 EP 3183933A1
Authority
EP
European Patent Office
Prior art keywords
communication device
transmission
control information
transmission resources
processor
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP14753076.0A
Other languages
German (de)
English (en)
Other versions
EP3183933B1 (fr
Inventor
Laetitia Falconetti
Jung-Fu Cheng
Anders FURUSKÄR
Bruhtesfa GODANA
Chrysostomos Koutsimanis
Gunnar Mildh
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Telefonaktiebolaget LM Ericsson AB
Original Assignee
Telefonaktiebolaget LM Ericsson AB
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Telefonaktiebolaget LM Ericsson AB filed Critical Telefonaktiebolaget LM Ericsson AB
Priority to EP23200906.8A priority Critical patent/EP4319448A3/fr
Priority to EP19218772.2A priority patent/EP3687258B1/fr
Publication of EP3183933A1 publication Critical patent/EP3183933A1/fr
Application granted granted Critical
Publication of EP3183933B1 publication Critical patent/EP3183933B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA
    • H04W74/0808—Non-scheduled access, e.g. ALOHA using carrier sensing, e.g. carrier sense multiple access [CSMA]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA
    • H04W74/0866—Non-scheduled access, e.g. ALOHA using a dedicated channel for access
    • H04W74/0891—Non-scheduled access, e.g. ALOHA using a dedicated channel for access for synchronized access

Definitions

  • the present invention relates to methods for managing a communication network and to corresponding devices.
  • some cellular communication systems such like GSM (Global System for Mobile Communications) provide a frequency reuse larger than one. This means that adjacent cells of the same network do not use the same frequency band, and therefore do not interfere with each other. However, cells sufficiently far away from each other may use the same frequency resources. This way, a moderate level of inter-cell interference is guaranteed, while at the same time allowing reuse of the frequency resources. While usage of cellular networks increases, available transmission resources tend to become more and more scarce. Accordingly, cellular technologies like the LTE (Long Term Evolution) technology specified by 3GPP (3rd Generation Partnership Project) have been developed to operate under conditions of high interference. The LTE technology may utilize a number of techniques to cope with high interference levels.
  • LTE Long Term Evolution
  • 3GPP 3rd Generation Partnership Project
  • multiple antenna techniques may be used to improve the effective SINR (Signal to Noise Ratio) by increasing signal diversity and utilizing receiver side interference mitigation capabilities.
  • link adaptation may be used to make the transmission robust towards interference.
  • MCS modulation and coding schemes
  • BLER block error probability
  • SINR Signal to Noise Ratio
  • SINR Signal to Noise Ratio
  • a robust MCS may be used for transmission.
  • SINR is high, a higher order MCS may be selected to obtain the largest possible data rate at a wanted BLER.
  • the BLER is typically set to 10%, sometimes even larger. This means that certain transmissions cannot be decoded correctly at the receiver.
  • a HARQ (Hybrid Automatic Request) protocol may be used as an error-recovery mechanism.
  • a HARQ retransmission By means of a HARQ retransmission the originally transmitted signal can be recovered in a short delay.
  • the above-mentioned robustness with respect to interference enables reuse of the same time-frequency resources in adjacent cells of the same network. This is called a reuse of one. Studies show that the achieved system capacity with a reuse of one is much higher than with separate time-frequency resources in adjacent cells.
  • LA-LTE Licensed-assisted access LTE
  • nodes of an LA-LTE network may need to coexist well with nodes of a WiFi network utilizing the same carrier. Further, the nodes of an LA-LTE network may need to coexist with nodes of a different LA-LTE network utilizing the same carrier.
  • RWS-140025 “Co-existence considerations for LTE-U"
  • the random backoff defines a time period which a node has to wait after sensing that a channel has become free, before transmitting on the channel. By means of the random backoff, it can be ensured that two or more nodes backing off do not start transmitting at the same time.
  • the usage of of the random backoff mechanism may also block possible usage of the carrier by certain nodes. For example, interfering transmissions of LA-LTE nodes of the same network may be possible due to the above-mentioned techniques of coping with high interference levels, but usage of the random backoff mechanism may result in such transmissions being prevented in the same way as other colliding usage of the carrier. Accordingly, there is a need for techniques which allow for efficiently controlling transmission in a communication network in view of efficient usage of transmission resources. Summary
  • a method of controlling transmission in a communication network detects potentially colliding usage of transmission resources. Further, the communication device detects cease of the potentially colliding usage of the transmission resources. After expiry of a backoff time period starting when detecting the cease of the usage of the transmission resources, the communication device performs a transmission on the transmission resources. This transmission is performed synchronously with a further transmission on the transmission resources by at least one other communication device.
  • a method of controlling transmission in a communication network is provided.
  • a node of the communication network provides control information to multiple communication devices. These communication devices perform transmissions on transmission resources after a backoff time period starting when detecting cease of potentially colliding usage of the transmission resources.
  • the control information enables synchronization of the transmissions by the communication devices.
  • a communication device is provided.
  • the communication device comprises at least one interface for transmission on transmission resources.
  • the communication device comprises at least one processor.
  • the at least one processor is configured to detect potentially colliding usage of the transmission resources and detect cease of the potentially colliding usage of the transmission resources.
  • a node for a communication network comprises an interface for controlling multiple communication devices. Further, the node comprises at least one processor. The at least one processor is configured to provide control information to the multiple communication devices. The multiple communication devices are configured to perform transmissions on transmission resources after a backoff time period starting when detecting cease of potentially colliding usage of the transmission resources. The control information enables synchronization of the transmissions by the multiple communication devices.
  • a computer program or computer program product is provided, e.g., in the form of a non-transitory storage medium, which comprises program code to be executed by at least one processor of a communication device.
  • Execution of the program code causes the at least one processor to detect potentially colliding usage of transmission resources and detect cease of the potentially colliding usage of the transmission resources.
  • execution of the program code causes the at least one processor to, after expiry of a backoff time period starting when detecting the cease of the usage of the transmission resources, perform a transmission on the transmission resources synchronously with a further transmission on the communication transmission resources by at least one other communication device.
  • a computer program or computer program product is provided, e.g., in the form of a non-transitory storage medium, which comprises program code to be executed by at least one processor of a node of a communication network. Execution of the program code causes the at least one processor to provide control information to multiple communication devices.
  • the multiple communication devices are configured to perform transmissions on transmission resources after a backoff time period starting when detecting cease of potentially colliding usage of the transmission resources.
  • the control information enables synchronization of the transmissions by the multiple communication devices.
  • Fig. 1 schematically illustrates a communication network in which transmissions may be controlled according to an embodiment of invention.
  • Fig. 2 schematically illustrates an exemplary scenario in which transmissions are synchronized according to an embodiment of the invention.
  • Fig. 3 schematically illustrates pseudo-random generation of a backoff time period as utilized according to an embodiment of the invention.
  • Fig. 4 schematically illustrates a further exemplary scenario in which transmissions are synchronized according to an embodiment of the invention.
  • Fig. 5 schematically illustrates a further exemplary scenario in which transmissions are synchronized according to an embodiment of the invention.
  • Fig. 6 schematically illustrates a further exemplary scenario in which transmissions are synchronized according to an embodiment of the invention.
  • Fig. 7 shows a flowchart for illustrating a method according to an embodiment of the invention.
  • Fig. 8 shows a flowchart for illustrating a further method according to an embodiment of the invention.
  • Fig. 9 schematically illustrates structures of a communication device according to an embodiment of the invention.
  • Fig. 10 schematically illustrates structures of a control node according to an embodiment of the invention.
  • the illustrated concepts relate to control of transmissions in a communication network. Specifically, the concepts relate to efficiently controlling avoidance of colliding usage of transmission resources.
  • the communication network may for example be based on one or more radio technologies, e.g., a cellular radio technology such as the LTE technology. If the communication network is based on a radio technology, the transmission resources may be frequency resources, such as one or more carriers.
  • Fig. 1 schematically illustrates exemplary elements of the communication network.
  • Fig. 1 it is assumed that the communication network is partitioned into different subnetworks, referred to as network A and network B.
  • network A exemplary nodes illustrated by Fig.
  • exemplary nodes illustrated by Fig. 1 include a third access node 100-3 (AP3) and a fourth access node 100-4 (AP4).
  • the access nodes 100-1 , 100-2, 100-3, 100-4 may for example correspond to base stations, such as an eNB (evolved Node B) of the LTE technology.
  • the UE 10 may for example correspond to a mobile phone, a smartphone, or some other kind of wirelessly connected device.
  • the UE 10 and the access nodes 100-1 , 100-2, 100-3, 100-4 will also be referred to as communication devices.
  • the communication devices 10, 100-1 , 100-2, 100-3, 100-4 are assumed to be configured for performing transmissions on the same transmission resources of the communication network.
  • these transmission resources may correspond to one or more carriers from an unlicensed frequency band, i.e., a frequency band which is not exclusively assigned to a certain network operator or radio technology.
  • Such carrier may for example be used for establishing an SCell (Secondary Cell) in a carrier aggregation constellation of the LTE technology.
  • SCell Secondary Cell
  • these different networks may each correspond to an LA-LTE network.
  • each of these LA-LTE networks mutual interference among nodes of the LA-LTE network is considered to be tolerable. However, between nodes of different LA-LTE networks, interference is considered to be not tolerable.
  • the different networks may be based on different radio technologies. For example, network A could correspond to an LA-LTE network, while network B corresponds to a WiFi network.
  • a CSMA (Carrier Sense Multiple Access) based mechanism is applied for avoiding colliding usage of the transmission resources by multiple communication devices.
  • the CSMA based mechanism involves that a communication device 10, 100-1 , 100-2, 100-3, 100-4 detects whether there is potentially colliding usage of the transmission resources, i.e., whether the transmission resources are free or not. For example, this detection may involve measuring an energy level on a carrier of the transmission resources. If the sensed energy level is below a certain threshold, the transmission resources may be regarded as free, and the communication device 10, 100-1 , 100-2, 100-3, 100-4 may proceed by performing a transmission on the transmission resources.
  • the communication device 10, 100-1 , 100-2, 100-3, 100-4 defers a transmission on the transmission resources, but waits until cease of the potentially colliding usage is detected.
  • the access nodes 100-1 and 100-2 may perform the transmission after the backoff time period synchronously.
  • the transmissions may be regarded as synchronous if they start within a time interval which is shorter than a sensing time T s required for detecting the potentially colliding usage of the transmission resources.
  • the communication devices 10, 100-1 , 100-2, 100-3, 100-4 may be assigned to the above-mentioned different subnetworks, e.g., to network A and network B as illustrated in Fig. 1 . If colliding usage of the transmission resources by two of the communication devices 10, 100-1 , 100-2, 100-3, 100-4 is deemed as tolerated, the two communication devices 10, 100-1 , 100-2, 100-3, 100-4 may be assigned to the same subnetwork. If colliding usage of the transmission resources by two of the communication devices 10, 100-1 , 100-2, 100-3, 100-4 is deemed as not tolerated, the two communication devices 10, 100-1 , 100-2, 100-3, 100-4 may be assigned to different subnetworks.
  • various criteria may be considered. For example, it can be taken into account whether one of the communication devices 10, 100-1 , 100-2, 100-3, 100-4 would be able to decode signals transmitted by the other communication device 10, 100-1 , 100-2, 100-3, 100-4. Further, it can be taken into account whether the communication devices 10, 100-1 , 100-2, 100-3, 100- 4 are associated with the same network operator, and colliding usage by communication devices associated with the same network operator may be deemed as tolerated. Further, the locations of the communication devices 10, 100-1 , 100-2, 100-3, 100-4 may be taken into account.
  • the colliding usage may be deemed as tolerated.
  • a mechanism exists to separate the transmissions by the two communication devices 10, 100-1 , 100-2, 100-3, 100-4 e.g., a mechanism based on multiple receive antennas, the colliding usage may be deemed as tolerated.
  • the assignment of the communication devices 10, 100-1 , 100-2, 100-3, 100-4 to the different subnetworks may be indicated implicitly, e.g., in terms of a network identity or node identity, such as a SSID (Service Set Identity), a BSSID (Basic Service Set Identity), or the like.
  • a network identity or node identity such as a SSID (Service Set Identity), a BSSID (Basic Service Set Identity), or the like.
  • the assignment may be indicated explicitly to the communication devices 10, 100-1 , 100-2, 100-3, 100-4, e.g., in terms of dedicated identifiers of the subnetworks.
  • the backoff time period applied by the communication device 10, 100-1 , 100-2, 100-3, 100-4 may be determined on the basis of a pseudo-random value.
  • the synchronization may be achieved by coordinating generation of the backoff time period applied by each of the communication devices 10, 100-1 , 100-2, 100-3, 100-4 in such a way that the communication devices 10, 100-1 , 100-2, 100-3, 100-4 of the same subnetwork will apply the same backoff time period while the communication devices 10, 100-1 , 100-2, 100-3, 100-4 from different subnetworks will apply different backoff time periods which are randomly determined.
  • the latter randomness may help to avoid that concerning the access to the transmission resources the communication devices 10, 100-1 , 100-2, 100-3, 100-4 of one subnetwork are favored over the communication devices 10, 100- 1 , 100-2, 100-3, 100-4 from the other subnetwork.
  • a corresponding exemplary scenario is illustrated in Fig. 2.
  • the scenario of Fig. 2 involves the communication devices AP1 , AP2, AP3, AP4, corresponding to the communication devices 100-1 , 100-2, 100-3, 100-4 of Fig. 1 .
  • the communication devices first check whether the transmission resources are free, as illustrated by the sensing time T s . If the transmission resources are found to be free, the communication device waits for the backoff time period T R before performing the transmission of data.
  • T s the scenario of Fig. 2
  • the same pseudo-random backoff time period T R is applied. That is to say, AP1 and AP2 apply the same pseudo-random backoff time period T R , and AP3 and AP4 apply the same pseudorandom backoff time period T R .
  • the pseudo-random backoff time period T R applied by AP1 and AP2 is smaller than the pseudo-random backoff time period T R applied by AP3 and AP4. Accordingly, AP1 and AP2 synchronously start their respective transmission of data, while AP3 and AP4 defer their transmission of data.
  • the transmissions by AP1 and AP2 are synchronized to start in the same subframe, which in the LTE technology typically has a duration of 1 ms.
  • a centralized control node such as the control node 200, could provide the pseudo-random backoff time periods to the different communication devices.
  • the control node 200 could generate the pseudo-random backoff time period T R applied by AP1 and AP2, while another control node (not illustrated) could generate the pseudo-random backoff time period T R applied by AP3 and AP4.
  • the same control node provides AP1 and AP2 with the same pseudo-random backoff time period T R , and provides AP3 and AP4 with another pseudo- random backoff time period T R .
  • AP1 and AP2 may be provided with the same pseudorandom backoff time period T R by utilizing the same algorithm and seed for generating the pseudo-random backoff time period T R .
  • the same algorithm, but a different seed may be utilized by AP3 and AP4.
  • the coordination of the pseudo-random backoff time period T R for the different subnetworks may thus be achieved by configuring the communication devices of one subgroup with the same seed while configuring the communication devices of different subgroups with different seeds.
  • This configuration could be accomplished by a centralized control node, such as the control node 200.
  • the control node 200 could provide the AP1 and AP2 with the same seed, while another control node (not illustrated) could provide AP3 and AP4 with another seed.
  • another control node (not illustrated) could provide AP3 and AP4 with another seed.
  • the same control node provides AP1 and AP2 with the same seed, and AP3 and AP4 with another seed.
  • control information indicating the pseudo-random backoff time period T R or the seed to the communication devices could be broadcast to the communication devices of the same subnetwork. Further, the control information could be included in dedicated messages to each communication device. In some scenarios, utilizing the same seed and algorithm in the communication devices of the same subnetwork may not be sufficient. For example, AP1 and AP2 may have originally used the same seed, but the transmission of AP2 may have been deferred due to the transmission of another communication device, which was not detected by AP1. This may cause AP2 to newly generate the pseudo-random backoff time period T R , while AP1 continues with the original pseudo-random backoff time period T R .
  • AP1 and AP2 would determine the pseudo-random backoff time period T R from the same pseudo-random sequence, but from different positions of the sequence. This may be addressed by regularly updating the seed of the algorithm to achieve the same state for each communication device of the subnetwork.
  • a corresponding example of generating the pseudo-random backoff time period T R is illustrated in Fig. 3.
  • the seed is set in a controlled manner at each relevant time instance. More specifically, the communication devices of the same subnetwork are assumed to be time-synchronized and have a method to get a current time with the same accuracy, which is typically the case for LTE networks. As illustrated, the current time may be used as a first seed of the algorithm implemented by a pseudo-random number generator 300 which generates the pseudo-random backoff time period T R . Further, a network identity (network ID) common to all nodes of the subnetwork, but different from other subnetworks, is utilized as a second seed of the algorithm.
  • network ID network identity
  • coordination of the pseudo-random backoff time period T R may be also be achieved in a distributed manner by transmission of control information between the communication devices.
  • This control information may allow for obtaining the same pseudorandom backoff time period T R for communication devices of the same subnetwork, while obtaining different pseudo-random backoff time periods T R fro communication devices of different subnetworks.
  • each transmission by a communication device may involve sending a preamble before the actual data.
  • AP1 transmits a preamble and AP2 transmits a preamble.
  • the preamble may include the control information for coordinating the generation of the pseudo-random backoff time period T R .
  • the preamble may include the network ID number and current state of the algorithm for pseudo-random generation of the backoff time period T R .
  • the communication devices receiving the preamble may determine from the network ID whether they belong to the same subnetwork and may then set their algorithm for generating future pseudo-random backoff time periods T R according to the received state.
  • the state of the algorithm does not need to be included in every transmission by the communication device.
  • the state could be included in a preconfigured periodic pattern.
  • the preamble could be of variable length and the communication device may include the state of the algorithm only when the preamble is long enough to accommodate the inclusion.
  • a more detailed process may be as follows:
  • one of the communication devices e.g., AP1
  • it may first monitor the transmission resources to check whether the transmission resources are already utilized by other communication devices, such as AP2, AP3, or AP4. If the communication device detects utilization of the transmission resources by one or more other communication devices from the same subnetwork, such as by AP2, it may adopt the state of the algorithm indicated by the other communication device for its own algorithm for pseudo-random generation of the backoff time period T R . Accordingly, the states of the algorithms for pseudo-random generation of the backoff time period T R will be coordinated to be the same for communication devices from the same subnetwork, e.g., for AP1 and AP2.
  • the communication device may select a local input to set the state of its algorithm for pseudo-random generation of the backoff time period T R .
  • such local input may be the current time, the network ID, the node ID, a serial number of the communication device, or a random number.
  • the communication device may set the state of its algorithm for pseudorandom generation of the backoff time period T R to be different from that indicated in the preamble transmitted by the other communication device. This may ensure that communication devices of different subnetworks apply different pseudo-random backoff time periods T R .
  • a UE associated with an access node of one of the subnetworks, such as the UE 10, may obtain the state of the algorithm for pseudo-random generation of the backoff time period T R from this access node.
  • the UE may also transmit the state of its algorithm for pseudorandom generation of the backoff time period T R in a preamble before it transmits data on the transmission resources and in this way indicate its network ID and the current state of the algorithm.
  • the UE may be instructed by its serving access node to transmit such preamble in a periodic manner or on a one-time basis, e.g., via a physical layer command or higher layer signaling such as in an RRC (Radio Resource Control) command.
  • the access node may select UEs that are farther away from the access node for such preamble transmission.
  • the access node can determine the distance to the UE based various kinds of metric, e.g., based on timing advance measurements and/or transmission power level measurements.
  • the pseudo-random generation of the backoff time period T R may be accomplished independently by each communication device, i.e., without coordination of the applied backoff time periods T R , and control information indicating a time instance of an upcoming transmission may be utilized for achieving the synchronization of the transmissions by the communication devices of the same subnetwork.
  • a corresponding exemplary scenario is illustrated in Fig. 4.
  • the scenario of Fig. 4 involves the communication devices AP1 , AP2, AP3, corresponding to the communication devices 100-1 , 100-2, 100-3 of Fig. 1 .
  • AP1 and AP2 are assigned to one subnetwork (network A) and that AP3 is assigned to another subnetwork (network B).
  • Each communication device applies an independently generated and thus different value of the pseudo-random backoff time period T R .
  • the pseudo-random backoff time period T R applied by AP1 is shorter than the pseudo-random backoff time periods T R applied by AP2 and AP3, which results in AP1 first deciding to starting its transmission after the backoff time period T R .
  • AP1 Before the transmission, AP1 sends a TX (transmit) notification which indicates the upcoming transmission.
  • This TX notification enables AP2 to synchronize its transmission with the transmission of AP1 . Further, the TX notification causes AP3 to defer its transmission of data.
  • the TX notification may implicitly indicate the time instance of the upcoming transmission by AP1. For example, the TX notification may implicitly indicate that the upcoming transmission starts at the beginning of the next or later subframe. Further, the TX notification may indicate a network ID of the communication device which sends the TX notification. This network ID may allow other communication devices to decide whether the upcoming transmission is from a communication device of the same subnetwork or from a communication device from another subnetwork. In the scenario of Fig.
  • the communication devices first check whether the transmission resources are free, as illustrated by the first sensing time T s after the arrival of data to be transmitted. If the transmission resources are found to be free, the communication device waits for the backoff time period T R and then sends the TX notification.
  • the TX notification is sent sufficiently early before the actual transmission of data so that it is possible to perform an additional check for usage of the transmission resources by other communication devices before the actual transmission of data, as illustrated by the sensing time Ts before the transmission of data by AP1 and AP2.
  • a time interval between sending the TX notification and the transmission of data is thus longer than the sensing time T s . In this way, it can be ensured that no other communication device has started utilizing the transmission resources after the TX notification was sent.
  • the other communication devices are provided with time which may be allowed for coordinating their action, such as scheduling the synchronous transmission by AP2. Further, sending the TX notification early may facilitate its combination with other notifications, such as a CTS (Clear to Send) notification as used in WiFi networks.
  • a CTS Cert to Send
  • An exemplary scenario in which the TX notification is combined with a CTS notification is illustrated in Fig. 5.
  • the scenario of Fig. 5 is generally similar to that of Fig. 4. In the scenario of Fig. 5 it is however assumed that AP3 is a WiFi communication device.
  • AP1 and AP2 may correspond to LA-LTE communication devices.
  • AP1 in addition to sending the TX notification, AP1 also sends a CTS notification.
  • the CTS notification may be sent immediately after or immediately before the TX notification.
  • AP2 may use the TX notification for synchronizing its transmission with the transmission by AP1 .
  • AP3 may in turn decide on the basis of the CTS notification to defer its transmission. Additional functionalities for interpreting the TX notification are thus not required for AP3.
  • the TX notification may be sent shortly before the upcoming transmission of data, with a time interval between sending the TX transmission being longer than the sensing time T s .
  • a corresponding exemplary scenario is illustrated in Fig. 6.
  • the scenario of Fig. 6 is generally similar to that of Fig. 4, however without the additional check for usage of the transmission resources immediately before starting the transmission by AP 1 and AP2.
  • Fig. 7 shows a flowchart for illustrating a method of controlling transmissions in a communication network, e.g., having structures as illustrated in Fig. 1 .
  • the method of Fig. 7 may be used for implementing the above-described concepts in a communication device, e.g., in an access node, such as one of the access nodes 100-1 , 100-2, 100-3, 100-4, or in a UE, such as the UE 10.
  • the steps of the method may be performed by one or more processors of the communication device.
  • the processor(s) may execute correspondingly configured program code. Further, at least some of the corresponding functionalities may be hardwired in the processor(s).
  • the communication device may receive control information. Further, the communication device may also send control information. As further explained below, the control information may have the purpose of enabling synchronization of transmissions by the communication device with further transmissions by at least one other communication device.
  • the communication device detects potentially colliding usage of transmission resources.
  • the transmission resources may for example correspond to one or more carriers, e.g., from an unlicensed frequency band.
  • the colliding usage may for example be detected by measuring an energy level on the transmission resources and comparing the measured energy level to a threshold. Such measurement may be performed over a certain time window, e.g., corresponding to the above-mentioned sensing time T s .
  • the communication device detects cease of the potentially colliding usage of the transmission resources. Again, this may involve measuring an energy level on the transmission resources and comparing the measured energy level to the threshold, and the measurement may be performed over the same time window as mentioned in connection with step 710.
  • the communication device waits at least for a backoff time period starting when detecting the cease of the usage of the transmission resources at step 730.
  • the backoff time period may be determined by the communication device on the basis of a pseudo-random value. Alternatively, the backoff time period could be indicated to the communication device, e.g., by a control node such as the control node 200.
  • the communication device performs a transmission on the transmission resources synchronously with a further transmission on the transmission resources by the at least one other communication device.
  • the communication device may utilize the control information sent or received at step 710.
  • the communication device may receive the control information from the at least one other communication device.
  • the control information may then include a seed for pseudo-random determination of the backoff time period as utilized by the at least one other communication device, e.g., as explained in connection with the distributed scenario of Figs. 2 and 3.
  • the received control information may include an indication of a time instance of the further transmission and/or the sent control information may include an indication of a time instance of the transmission by the communication device.
  • An example of such indication is the TX notification explained in connection with Figs. 4, 5, and 6.
  • the communication device may also receive the control information from a node which is responsible for controlling the communication device and the at least one further communication device, such as from the control node 200.
  • the control information may then include a seed for pseudo-random determination of the backoff time period.
  • the node may provide the same seed to both the communication and to the further communication device.
  • the control information could also directly indicate the backoff time period, e.g., as determined by an algorithm implemented at the node.
  • the seed for pseudo-random determination of the backoff time period may be based on a network ID and/or a current time. Further, the communication device may update the seed on a regular basis, e.g., on the basis of newly received control information or by sending new control information.
  • a time interval between receipt of the control information by the communication device and the transmission by the communication device may be larger than a sensing time for detecting usage of the transmission resources, such as explained connection with the scenarios of Figs 4 and 5.
  • the communication device may then rechecking for potentially colliding usage of the transmission resources. This recheck may be utilized by the communication device to performing the transmission only in response to detecting no usage of the transmission resources by one or more other communication devices.
  • a time interval between receipt of the control information by the communication device and the transmission by the communication device may be shorter than a sensing time for detecting usage of the transmission resources, such as explained connection with the scenario of Fig. 6.
  • Fig. 8 shows a flowchart for illustrating a method of controlling transmissions in a communication network, e.g., having structures as illustrated in Fig. 1 .
  • the method of Fig. 8 may be used for implementing the above-described concepts in a node which is responsible for controlling multiple communication devices, such as the control node 200.
  • the communication devices may for example correspond to access nodes, such as the access nodes 100-1 , 100-2, 100-3, 100-4, or to UEs, such as the UE 10.
  • the steps of the method may be performed by one or more processors of the node.
  • the processor(s) may execute correspondingly configured program code. Further, at least some of the corresponding functionalities may be hardwired in the processor(s).
  • the node may control the communication devices. This may for example involve sending various kinds of control information to the communication devices.
  • the node determines control information for synchronizing transmissions by the multiple communication devices.
  • the control information may include a seed for pseudorandom determination of the backoff time period.
  • the node may provide the same seed to both the communication and to the further communication device.
  • An example of corresponding processes is as explained in connection with the centralized scenario of Figs. 2 and 3. Further, the control information could also directly indicate the backoff time period, e.g., as determined by an algorithm implemented at the node.
  • the seed for pseudo-random determination of the backoff time period may be based on a network ID and/or a current time. Further, the node may update the seed on a regular basis, e.g., by determining and sending new control information.
  • the node sends the control information to the communication devices. For example, this may be accomplished by broadcasting the control information to the communication devices or by sending a dedicated message to each of the communication devices.
  • step 710 in Fig. 7 could also be sent after detecting the cease of the potentially colliding usage in step 730.
  • One example of such scenario is sending the control information in the form of a TX notification as explained in connection with the scenarios of Figs. 4, 5, and 6.
  • Fig. 9 illustrates exemplary structures for implementing a communication device which operates in accordance with the above-described concepts.
  • the illustrated structures may be used to implement one of the access nodes 100-1 , 100-2, 100-3, 100-4 or the UE 10.
  • the communication device may include a transmission interface 910 for performing transmissions in the communication network.
  • the transmission interface 910 may correspond to a radio interface, e.g., on the basis of a cellular radio technology, such as the LTE technology.
  • the communication device may include a control interface 920.
  • the control interface 920 may for example have the purpose allowing remote control or configuration of the communication device.
  • the communication device includes one or more processor(s) 950 coupled to the interfaces 910, 920 and a memory 960 coupled to the processor(s) 950.
  • the memory 960 may include a read-only memory (ROM), e.g., a flash ROM, a random access memory (RAM), e.g., a dynamic RAM (DRAM) or static RAM (SRAM), a mass storage, e.g., a hard disk or solid state disk, or the like.
  • the memory 960 includes suitably configured program code modules to be executed by the processor(s) 950 so as to implement the above- described functionalities of the communication device, e.g., as illustrated by the method of Fig. 7.
  • the program code modules in the memory 960 may include a transmission control module 980 so as to implement the above-described functionalities of controlling transmissions, e.g., by detecting potentially colliding usage of the transmission resources and waiting for the backoff time period before performing the transmission, e.g., as explained in connection with steps 720, 730, 740, and 750 of Fig. 7. Further, the program code modules in the memory 960 may include a synchronization control module 980 so as to implement the above-described functionalities of synchronizing the transmission with the further transmission, e.g., as explained in connection with step 750 of Fig. 7. Further, the program code modules in the memory 960 may include a signaling module 990 so as to implement the above-described functionalities of receiving or sending control information for enabling the synchronization.
  • a transmission control module 980 so as to implement the above-described functionalities of controlling transmissions, e.g., by detecting potentially colliding usage of the transmission resources and waiting for the backoff time period before performing the
  • the structures as illustrated in Fig. 9 are merely schematic and that the communication device may actually include further components which, for the sake of clarity, have not been illustrated, e.g., further interfaces or further processors.
  • the memory 960 may include further types of program code modules, which have not been illustrated, e.g., program code modules for implementing known functionalities of an access node or UE.
  • a computer program may be provided for implementing functionalities of the communication device, e.g., in the form of a physical medium storing the program code modules to be stored in the memory 960 or by making such program code available for download or streaming.
  • control node 10 illustrates exemplary structures for implementing a control node which operates in accordance with the above-described concepts.
  • the illustrated structures may be used to implement the control node 200.
  • the control node may include a control interface 1010.
  • the control interface 1010 may have the purpose controlling or configuring multiple communication devices of a communication network.
  • the communication device includes one or more processor(s) 1050 coupled to the interface 1010 and a memory 1060 coupled to the processor(s) 1050.
  • the memory 1060 may include a ROM, e.g., a flash ROM, a RAM, e.g., a DRAM or SRAM, a mass storage, e.g., a hard disk or solid state disk, or the like.
  • the memory 1060 includes suitably configured program code modules to be executed by the processor(s) 1050 so as to implement the above-described functionalities of the control node, e.g., as illustrated by the method of Fig. 8.
  • the program code modules in the memory 1060 may include a control module 1080 so as to implement the above-described functionalities of controlling communication devices, e.g., by sending various kinds of control information. Further, the program code modules in the memory 1060 may include a synchronization control module 1080 so as to implement the above-described functionalities of enabling synchronization of the transmissions by multiple communication devices controlled by the control node, e.g., by determining corresponding control information as explained in connection with step 850 of Fig. 8. Further, the program code modules in the memory 1060 may include a signaling module 1090 so as to implement the above-described functionalities of sending the control information for enabling the synchronization to the communication devices.
  • control node may actually include further components which, for the sake of clarity, have not been illustrated, e.g., further interfaces or further processors.
  • the memory 1060 may include further types of program code modules, which have not been illustrated, e.g., program code modules for implementing known functionalities of a control node.
  • program code modules which have not been illustrated, e.g., program code modules for implementing known functionalities of a control node.
  • a computer program may be provided for implementing functionalities of the control node, e.g., in the form of a physical medium storing the program code modules to be stored in the memory 1060 or by making such program code available for download or streaming.
  • the concepts as described above may be used for efficiently avoiding undesired collisions on certain transmission resources while at the same time allowing efficient reuse of the transmission resources.
  • the examples and embodiments as explained above are merely illustrative and susceptible to various modifications.
  • the concepts may be applied in various kinds of communication networks, without limitation to the illustrated example of a cellular network or radio networks.
  • the concepts could also be applied to various kinds of wire-based communication networks.
  • the above concepts may be implemented by using correspondingly designed software to be executed by one or more processors of an existing device, or by using dedicated hardware.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Small-Scale Networks (AREA)

Abstract

Selon l'invention, un dispositif de communication (10, 100-1, 100-2, 100-3, 100-4) détecte le risque de collision d'utilisation de ressources de transmission. De plus, le dispositif de communication (10, 100-1, 100-2, 100-3, 100- 4) détecte la cessation du risque de collision d'utilisation des ressources de transmission. Après expiration d'une période temporelle de retrait commençant lors de la détection de la cessation de l'utilisation des ressources de transmission, le dispositif de communication (10, 100-1, 100-2, 100-3, 100-4) effectue une transmission sur les ressources de transmission. Cette transmission est effectuée de manière synchrone avec une autre transmission sur les ressources de transmission par au moins un autre dispositif de communication (10, 100-1, 100-2, 100-3, 100-4).
EP14753076.0A 2014-08-19 2014-08-19 Évitement de collision avec une transmission synchronisée Active EP3183933B1 (fr)

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EP23200906.8A EP4319448A3 (fr) 2014-08-19 2014-08-19 Évitement de collision avec transmission synchronisée
EP19218772.2A EP3687258B1 (fr) 2014-08-19 2014-08-19 Évitement de collision avec transmission synchronisée

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PCT/EP2014/067691 WO2016026521A1 (fr) 2014-08-19 2014-08-19 Évitement de collision avec une transmission synchronisée

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EP19218772.2A Division EP3687258B1 (fr) 2014-08-19 2014-08-19 Évitement de collision avec transmission synchronisée

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EP3687258B1 (fr) 2023-10-04
CN107079487A (zh) 2017-08-18
WO2016026521A1 (fr) 2016-02-25
EP4319448A3 (fr) 2024-03-27
CN113630899B (zh) 2024-06-04
US20170245303A1 (en) 2017-08-24
ES2965865T3 (es) 2024-04-17
ES2782000T3 (es) 2020-09-09
CN107079487B (zh) 2021-07-09
EP3687258C0 (fr) 2023-10-04
EP3687258A1 (fr) 2020-07-29
CN113630899A (zh) 2021-11-09
EP4319448A2 (fr) 2024-02-07
EP3183933B1 (fr) 2020-01-01

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